Dental drilling, milling, and grinding tool



May 18, 1954 E, HQFFMEISTER ET AL 2,678,494

DENTAL DRILLING, MILLING, AND GRINDING TOOL Filed March 19, 1951 zvezzaf E .Haffme L Giel Ji' E om Patented May 18,I 1954 i oFFice DENTAL DRILLINaMILLING, AND GRINDING TQOL Erich Hoffmeister and` Kurt Rhm, A I Biberach-Riss, Germany `A.solltestim Marchio, 1951,' serial No. 216,304

Claims priority;` application Germany t March 22,1950 f i 7 Claims.

-This'invention relatesl to an angle piece' with `anlangle connecting shafting for dental drilling. milling and grinding tools, in which a sleeve cov- `ering @the Lipper drive and the entire adjoining drive bearing is removably attached `to the shafting and can be Withdrawn together with the head frorn7t'he`drive`bearing. With such angle pieces ftheA attachment of` the sleeve to the shafting is n frange ofthe linger rests more towards the rear- `ward end'of the'holding sleeve and to give the spring-loaded pinia corresponding construction,

The invention has `for its object to" provide an effective xing arrangement which cloesl away awith theA hitherto `'generally used spring-loaded According to the invention it is proposed that :the rearend of the sleeve attached to the head litoge'therfwith the" angle connecting shafting xed tothe forward end of the lower drive bearhing be constructed in` such a manner that they "can lbe secured like a bayonet joint and be made vlfast. by Ineans of a clamping nut havingr aninternalthread which nut is rotatable at the rearward endof the holding sleeve, but is not axi- `ally displaceable, and engages with acorrespond- :inglyexternal thread of the' axially displaceable ylowerdrive bearing. The reliable securing of the islee've attached to the head, when 'tightening up the clamping nut,` is effected througha conically "tapering rear'en'd of the sleeve "of the head 'enigaging. a corresponding internal cone at the for- Ward end ofthe holding sleeve.

Bgforewtightening up the clamping nut the sleeve providedwiththe head is locked to the holding partin abayonet-likernanner. For this purpose the lower end of the sleeve iixedto the head :nasen inwardly projecting l collar 1 and diaric-ally @wenn 10is..,vhi1st .the forward end Lof the angle connecting Shafting is provided with dian'letrically opposite lugs which, after entering intofthe slots of the sleeve and after the sleeve `:has beentrned, .engage .over4 the inwardly pron l 2 jecting collar at the end of the sleeve. After being thus secured in the manner of a bayonet joint, the sleeve with the head can by turning the clamping nut be drawn up tightly without any play against the angle connecting shaiting and against the holding sleeve. Before `the `nut is tightened up, the Vhead may be brought. into any desired angular position with respect tothe holding sleeve.

The angle connecting `shafting is secured against turning in the forward end `of `the hold'- ing sleeve, this being preferably eiected `:by .the insertion into the forward end of the` holding sleeve of a profiled ring, in which the corre'- spondingly profiled external periphery oi the shafting is guided.

The invention is applicable both to angle pieces with angle connecting shafting, which can bere.- leasably secured by means of a` connecting sleeve to a sliding connection sleeve, and toangle pieces with angle connecting shafting, which are releasably xed to a straight dental hand piece through a base sleeve engageable over the end `of a sheath of said latter hand piece.

` Ar. angle piece with angle connecting shafting constructed in accordance with thelnv'entionis illustrated by way of example in the accompany- `ing drawing, in which:

Fig. 1 shows a side View of an angle connecting shafting, .i

Fig. 2 is a longitudinal section of the holding sleeve with clamping nut and connecting sleeve,

Fig. 3 shows the rear part of thesleeveprovided with the head in longitudinal section, partly in elevation, c

Fig. 4 shows the middle drive and the lower drive with bearings and the angle connecting shafting in elevation,v l Fig. lla shows the angle connecting shaftinglin section on line I--I of Fig. e, i Fig. 5 shows the rear end oi the sleeve ofth head and the angle connecting' shafting inelevation, viewed from the rear, and e l Fig'. 6 is a longitudinal section of an angle piece with angle connecting shafting and clamping nut and the rneans for connecting these portions together. i

` In Figs. l and 3, the part i is the sleeve covering the middle drive bearing, whichat its frward end carries the tool holding head portion 2 `of the angle piece, 3 the holding sleeve;fllthe clamping nut at the rear end` of the holding sleeve and 5 the connecting sleeve. l l

As win be seen from Fig. 2, there is `previene-d at "the 'rearl endof theI holding sleeve 3 the Wexangle piece with ternally knurled clamping nut 4 which is rotatable, but not axially displaceable thereon. On the rear neck of the clamping nut t is mounted the connecting sleeve 5, also rotatable and not axially displaceable. The clamping nut d has an internal thread B, into which is screwed the external thread of the rear bearing l for the lower drive la. At the forward end of the lower drive bearing is mounted the angle connecting shafting 8, at the forward end of which isxed thev bearing 9 of the middle drive lll. In the forward end of the holding sleeve 3 is inserted a proled ring I l which guides the correspondingly profiled outer surface of the angle connecting shafting. This ring il is preferably xed by soldering to the holding sleeve 3 and its inner circumference is adapted to correspond with the outer circumference of the rear part of the angle connecting shafting (Fig. 6). In this way any turning of the angle connecting shafting with respect to the holding sleeve 3 is prevented. The rear end of the sleeveV i` has an inwardly projecting collar i2 and is provided with diametrically opposite slots I3, so that the sleeve Vi can be slipped on to the forward part of the angle connecting shafting. The forward part of the latter shafting is provided with diametrieally opposite lugs le which are preferably fixedby soldering and which enter the slots i3, when the sieeve i is slipped on. As soon as the lugsY te abut against the bottom of the slots it, the sleeve i can be turned whereupon the lugs le will enter groove ict and engage over the collar l2 at the rear end of the sleeve i. YIn this way a bayonet-like lock between the sleeve l and the shafting a is established. Upon the clamping nut i being then turned, the lower drive bearing i with the shafting 8 will be drawn axially rearwards. same time the sleeve l will be drawn with its externally conically tapered end i5 into the corresponding internal cone le at the forward end of the holding sleeve V and held there nondisplaceably. Before the nut 4 is tightened, the sleeve provided with the head portion can be brought intoany desired angular Yposition with vrespect to the holding sleeve-3 since the lugs-Ul Vcan rotate unhindered in the'groove 12a.

For the removal of the sleeve i provided with the head portion 2 all that is necessaryris to slightlyloosen the-clamping nut 4, whereupon the sleeve l canbe turnedV relativelyY to the angleconnecting shafting so far that the lugs lei nut. engaging with the saidrscrew thread for securing the head portion firmly to the forward end of the lower drive bearing, the said clamping nut being supportedrat the rear end of the holding sleeve to permit it being rotatable` but not axially.V Vdisplaceable thereon.

2.` An angle piece as claimed in claim 1, having the forward end of the holding sleeve formedV with an internally conical aperture, and the rear end of the headpiece sleeve conically tapered to inter-engage in said conical aperture.

` A3.,Anangle piece with'V an angle connecting f At the shafting for dental tools, comprising: a headpiece, a sleeve attached to the headpiece, an inwardly projecting collar on the rear end of the sleeve attached to the headpiece, the rear end of the said sleeve being formed with diametrically opposite slots, diametrically opposite lugs on the forward end of the shafting adapted to enter the said slots and to engage behind the said inwardly projecting collar when the sleeve has been turned, a holding sleeve, a lower drive bearing the forward end of whichY is Xed to the shafting, an external screw thread on the lower drive bearing, and a clamping nut engaging with the said screw thread for securing the head firmly to the forward end of the Ylower drive bearing, the said clamping nut being supported at the rear end of the holding sleeve to permit it being rotatable but not axially displaceable thereon.

4. An angle piece as claimed in claim 1, further comprising a profiled ring inserted into theforward end of the holdingsleeve, the external surface ofthe shafting being correspondingly profiled and being guided in the said ring so asto secure the shafting against turning relatively Vto the holding sleeve.

5. A contra' angle attachment comprising a separably connected headpiece with a sleeve at one end, an angle connecting shafting and a holding sleeve, said headpiece having `an intertting relationship with said holding sleeve, a bayonet joint formed on thesleeve of the said headpiece and said angle connecting shafting, said holding sleeve being engageable with the sleeve of the said headpiece over said bayonet joint for conning said joint in holding relationship,Y and said. holding sleeve having means adapted Yto be manually operable to secure the sleeve of said headpiece and said holding sleeve firmly together in interfitting relationshipwith one another. Y Y

6. A contra angle attachment as claimed in claim 5, further comprising means interposed between said holding sleeve and said shafting to prevent relative rotation between the shafting `and the forward end of said sleeve.

7. An angle piece with angle connecting shafting for dental tools, comprising: aheadpiece, a

sleeve attached to the headpiece, a bayonet vjoint Y ,removablyconnecting the rear end of said sleeve Yto an angle connecting shafting, a holding sleeve the forward end of which is formed with an internally conical aperture,.the rear endV of the sleeve attached to the headpiece being VconicallyV Eeferenees cited inthe sie of this patent UNITED sTATEs PATENTS Number :Name Y. Date 1,534,817 v Thiedemann et al. Apr. 2l, 1925 v V2,370,632V Blair j Mary, 1945 Y Y FOREIGN PATENTS y Number Country Date France '..SeptA 6, 1943 

